F-557311 Alternator Freewheel Pulley AKA 535 0165 10 for Mercedes-BenzF557311 Alternator Overrunning Pulley Fits select Mercedes Benz models with Valeo alternators The F557311 is an overrunning alternator pulley (also known as a freewheel clutch pulley) designed for multiple Mercedes Benz models from 2002 2024. It helps reduce belt tension, improve alternator lifespan, and minimize engine vibration at idle. Interchangeable with several OE and aftermarket references. Fits Valeo alternators on C Class, E Class, SLK, CLK,